#include <stdio.h>
void main()
{
    int num,a;
    printf("please insert a number\n");
    scanf("%d",&num);
    a=num>0;
    switch(a)
    {
        case 1: 
        printf("It is a positive number");break;
        case 0:
        printf("It is a negative number");break;
    }
}
